Formatting cleanup which shouldn't affect the code.

I also changed the test that was failing to the proper result
even though the test isn't fixed yet.

Change-Id: I49a9fa27b0fa17005fd41212986839f513d06b3a
Fixing the way that the cached data is accessed.

Before, the field data was getting cached incorrectly in that
it was accessing the cached data set and field data when it
only should have been accessing the cached data set but
current point data.

Change-Id: Ic15f84541ac98303d5526c81d1341e2cc589ca88
More particletracer cleanup that shouldn't change behavior.

Change-Id: If4b3a83fcb842bb0a692df10efbd7da71ef29141
Now updating the particle age properly when it exits the domain.

Change-Id: I1e75ab9f65a23c5038e1c8ce06a20464987dc364
Improving the documentation of vtkParticleTracerBase.

Change-Id: Icc00099eb296d242e4ae5ab05f928a7bdc74e108
Reverted change to vtkParticleTracerBase specific setter macro.

Several setter methods needed to also reset the cache so I needed
to revert back to the original macro that I removed during
refactoring.

Change-Id: I8efbfbaaf36fbf17345dd4748b18e77236b4693d
Merge topic 'fix_particle_tracking' into master

4422dc5f Reverted change to vtkParticleTracerBase specific setter macro.
13f05e98 Improving the documentation of vtkParticleTracerBase.
93f187cd Now updating the particle age properly when it exits the domain.
4db27d8e More particletracer cleanup that shouldn't change behavior.
90cbb8f8 Fixing the way that the cached data is accessed.
50470ad0 Formatting cleanup which shouldn't affect the code.